#define  _CRT_SECURE_NO_WARNINGS
//12
#include <stdio.h>
int main()
{
	int h = 0;
	int r = 0;
	int V = 0;
	scanf("%d%d", &h, &r);
	V = 314 * r * r * h;
	int num = 0;
	num = (20 * 1000 * 100)/V;
	if (((20 * 1000 * 100)%V) != 0)num++;
	printf("%d\n", num);

	return 0;
}